actually the trick is that SD cards have dust inside of them, not actual dust but small sand like plastic thats made of coal. you can use a small heated needle to melt a hole on the side and then use a syringe to place more coal dust in(if you dont have that grind sugar). it sends electricity through and each atom gets data stored to it when it places stuff in it. you can increase by somewhere around 1-3GB depending on quality of coal or sugar dust.
why sugar and coal? they have a specific amount of electrons around them that lets electricity store data on them. anything else doesnt really work